Reamer for use in mining



(No Model.) 2 Sheets-Sheet 1. R. H. ELLIOTT 8u J. B. GARRINGTON.

BEAMER POR USB IN MINING.

Patented July 2, 1895.

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2 Sheets--Sheet 2. R. H. ELLIOTT & J. B. CARRINGTON.

BEAMER FOR. USE IN MINING.

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TATES PATENT OFFICE.

ROBERT H. ELLIOTT AND -JOHN B. OARRINGTON, OF BIRMINGHAM, ALA- BAMA, ASSIGNORS TO THE ALABAMA BLASTING AND MINING COM- PANY, OF ALABAMA.

REAMER FOR uslal IN MINING.

SPECIFICATION forming part of Letters Patent No. 542,152, dated July 2, 1895.

Application filed November 1, 1894. Serial No. 527,632 (No model.) 7

To all whom it may concern,.-

Be it known that we, ROBERT H. ELLIOTT and JOHN B. OARRINGTON, citizens of the United States, residing at Birmingham, in the county of Jefferson and State of Alabama, have invented certain new and useful Improvements in Means of Oentering Beamers; and we do hereby declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to improvements in reamers for use in mining, and it especially relates to improved means of centering .the

reamer in the bore-hole, whereby a more uniform action of the reamer on the various sides of the bore-hole is secured.

Reference is had to the accompanying drawings, wherein the 'same parts areindicated by the same letters throughout the several Y views.

Figure 1 represents a side elevation of a reamer-spindle fitted with our improved centering device, the reamer-cutters, which may be of any well-known form-such, for instance, as those shown in our applications, Serial No. 499,814, led February l0, 1894, Serial No. 500,910, led February 20, 1894, and Serial No. 509,096, filed April 26, 1894- are omitted from .the drawings. Fig. 2 represents an end view of the device shown in Fig. l, as seen from the right of the said ligure. Fig. 3 represents a central longitudinal Vsection of the device shown in Figs. 1 and 2 and illustrates its use in a drill-hole, and Fig. 4 represents a side elevation of a modification of the device shown in the other figures. Fig. 5 represents a side elevation of the front end of a reamer with the centering device shown in Figs. l to 3 in use in a bore-hole.

A represents the bore-hole, which has been previously drilled in the ordinary way.

B represents the front end of the reamer shaft or spindle, the cutters of which are not shown. This spindle is provided with screwthreads b to engage the screw-thread c on the rear end of the reamer-head C, which reamerhead is provided with an annular flange c and a cylindrical lug c2 projecting in front of said tlange. The sleeve fD has a lip d projecting behind said annular ya'nge and free to revolve on said reamer-head. The forward portion of said sleeve is interiorly screw-threaded,

rear portion of the' cap E, which cap is hollowed out, as at e', to receive the lug c2 and to revolve freely. about said lug. The said cap E is provided with perforated lugs e3, a shoulder e2, and a cylindrical forward portion e4. Mounted over the forward end of this cylindrical portion e4 is a sliding cap F provided with perforated lugsf. The links H and H', preferably three of each,although a greater number may be employed, connect the lugs fand c3,and thus secure the sliding cap Fon the fixed cap E. These pairs of linksH and H form a plurality of toggle-joints,which are normally kept nearly straight by the coilspring K interposed between the shoulder e2 and the sliding cap F.

on the reamer-spindle from the rear while the sliding cap Fis held rigid the cylindrical portion e4 will slide into the cap F, compressing the spring K and causing the various togglejoints to press outward uniformly, thus centering the reamer-spindle in the bore-hole. As soon as the pressure is relieved, the spring K will straighten the toggle-joints and the reamer' may be readily withdrawn from the bore-hole.

VIt will be seen that the reamer-spindle will revolve freely, the head O being journaled in the sleeve D andthe cap E.

The reamer shown in Fig. 5 is provided with a cutting-blade O, pivoted at o, and an auxiliary cutting-blade O, as described in detail in our Patent No. 530,512, granted Dedcember 11, 1894.

In the modification shown in Fig. 4 the sleeve D is faced with a ring P, which ring is provided with a plurality of radial dovetailed grooves, in which slide freely the dovetailed lugs m at the base of the blocks M. The backs of the 'blocks are provided with lugs m, to which the links H2 are pivotally connected, which links are also pivotally connected to the lugs f on the sliding cap F.

This cap is normally pressed forward by the as at d', to engage the screw-threads e on the It will be evident that if pressure be brought IOO spring K and tends to drag the block M inward toward the axis of the reamer. When the reamer is pressed forward against the action of the spring K, the sliding collar F being held rigidly, the blocks M will be forced out radially and will hold the reamer centered in the bore-hole. As soon asthe pressure is removed, the spring K will force the sliding cap F forward again, drawing in the block M and allowing the reamer to be readily withdrawn from the bore-hole.

It will be obvious that various modificaions of the herein-described device might be made which could be used without departing from the spirit of my invention. It will be evident that theherein-described centering device will allow the reamer to be readily inserted in and withdrawn from the bore-hole. Also,it will, by properly centering the reamer, secure the uniform cutting of the reamer-blades and materially lessen the time and labor required in reaming out a chamber for the explosive charge.

Having thus described our invention, what we claim, and desire to secure by Letters Pat.- ent of the United States, is-

l. The combination, with a reamer spindle of a centering device forming a journal bearing for the forward end thereof, the said centering device being provided with three or more extensible arms adapted to press outward when said centering device is subjected to longitudinal pressure, substantially as described.

2. The combination with a reamer spindle, of a cap forming a journal bearing therefor, a sliding cap mounted on said first capand extensible arms connected to said first cap and operated by said sliding cap, substantially as described.

3. The combination, with a reamer spindle, of a centering device forming a journal bearing for the forward end thereof, the said centering device being provided with three or more extensible arms adapted to press outward when said centeringr device is subjected to longitudinal pressure; with a spring normally drawing said extensible arms inward toward the axis of the reamer spindle, substantially as described.

4. The combination, with a reamer spindle, of a cap forming a journal bearing therefor; a sliding cap mounted on said first cap, and

extensible arms connected to said first cap and operated by said sliding cap; and a spring interposed between said caps and normally tending to draw said arms inward toward the axis of the reamer spindle, substantially as described.

5. In a reamer spindle centering device, the combination with the reamer spindle, of a cap forming a journal bearing therefor and terminating in a forwardly projecting lug, a sliding cap normally projecting beyond the end of said lug, and extensible arms connected to said first cap and operated by pressure on said sliding c'ap, substantially as and for the purposes described. Y

6. In a reamer spindle centering device, the combination with the reamer spindle,of a cap forming a journal bearing therefor and terminating in a forwardly projecting lug, a sliding cap normally projecting beyond the end of said lug, and extensible arms connected to said first cap and operated by pressure on said sliding cap, and a spring interposed between said caps and normally tending to press forward said sliding cap, substantiallyas and for the purposes described.

7. In a reamer spindle centering device, the combination with the reamer spindle, of a cap lforming a journal bearing therefor and ter` minating in a forwardly projecting lug, a slid ing cap normally projecting beyond the end of said lug, and toggle joints connected to each of said caps and operated by pressure on said slidingr cap, substantially as and for the purposes described.

8. In a reamer spindle centering device, the combination with the reamer spindle, of a cap forming a journal bearing therefor and terminating in a forwardly projecting lug, asliding cap normally projecting beyond the end of said lug, and toggle joints connected to each of said caps and operated by pressure on said sliding cap, and a spring interposed between said caps and normally tending to press forward said sliding cap, substantially as and for the purposes described.

In testimony whereof we affix our signatures in presence of two witnesses.

ROBERT H. ELLIOTT. JOHN B. CARRING"ON. Witnesses:

W. G. ROBINSON, Il. C. KENNARD.

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